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The influence of structural Fe, Al and Mg on the infrared OH bands in spectra of dioctahedral smectites

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Abstract:

Visible to near-infrared (NIR) reflectance spectra and mid-IR transmittance spectra are presented here for a collection of dioctahedral smectites. Analysis of the structural OH vibrations is performed by comparing the NIR combination and overtone bands with fundamental stretching and bending absorption features in the mid-IR region. Second derivatives are used to determine the actual band centres, which are often shifted slightly by a spectral continuum in the reflectance or transmittance spectra. New bands have been identified near 4170 and 4000 cm-1 in the NIR spectra of nontronite with tetrahedral substitution. A related band is observed near 4100 cm-1 for montmorillonites with substantial tetrahedral and/or octahedral substitution. These bands are correlated with the mid-IR bands near 680 cm-1 for nontronite and near 630 cm-1 for montmorillonite. Comparison of the OH overtone and combination bands with the fundamental stretching and bending vibrations gives consistent results.

Keywords: INFRARED SPECTROSCOPY; MONTMORILLONITE; NONTRONITE; SMECTITES; STRUCTURAL OH

Document Type: Research Article

DOI: http://dx.doi.org/10.1180/0009855023740063

Publication date: December 1, 2002

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minsoc/cm/2002/00000037/00000004/art00005
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